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Top 5 Web Performance Metrics You Should Know

Vamsi Krishna Kodimela
Frontend Simplified
2 min readJan 9, 2025

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Building performant web applications is crucial these days. Optimizing web performance is critical for better user experience and SEO rankings.

Let’s see five metrics that help you measure and improve your web application performance.

Fast websites = happy users = better rankings! 🚀

Largest Contentful Paint (LCP)

  • The time it takes for the largest visible element (e.g., image or text block) to load and become visible in the viewport.
  • Less than 2.5 seconds.
  • It reflects how quickly the main content appears to users, improving perceived load speed.

Tips to Optimize:

  • Optimize images.
  • Use lazy loading.
  • Minify CSS and JavaScript.

First Input Delay (FID)

  • The time from when a user first interacts with your site (e.g., clicking a button) to when the browser responds.
  • Less than 100 milliseconds.
  • Ensures the site feels responsive and interactive.

Tips to Optimize:

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Frontend Simplified
Frontend Simplified

Published in Frontend Simplified

Level up your frontend skills with “Frontend Simplified.” We provide roadmaps, interview prep, in-depth articles, and case studies covering Advanced JavaScript, React, Angular, and frontend system design to help you advance your career.

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